Lathe or grinder attachment



April 23, 1929. L. A. DALL 1,710,016

LATHE OR GRINDER ATTACHMENT Filed July 2, 1927 2 Sheets-Sheet 1 Patented Apr. 23, 1929.

UNITED STATES g 1,710,016 PATENT OFFICE.

LOUIS A. DALL, OF OLMSTEAD FALLS, OHIO.

LATHE OR GRINDER ATTACHMENT.

Application filed July 2, 1927. Serial No. 203,121.

This invention relates'to an improved and novel attachment for metal Working machines and particularly to a device for use in connection with a lathe or grinder for finishing or grinding pistons, having in View primarily a simple inexpensive and efficient appliance capable of use with standard machine shop equipment. i

Another important object accomplished by the use of the present invention, by reason of the novelconstruction and arrangement of parts, is that the pistons are accurately centered and rotated for grinding without distortion, which is absolutely necessary to the production of a true and accurately balanced piston. p

Another object is toprovide such a device,

whereby upon the interchanging of certain parts in an expeditious and simple manner, the same can be adapted for use in connection with pistons of various sizes and the time usually required for changing the set up to su t different sized pistons is reduced to a minimum.

Another object is the production of a device of this character formed of very few simple but welldesigned parts capable of being quickly assembled into a strong compact balanced unit whereby the breakinge factor Wlll be substantially nil.

, The preferred embodiment of the invention is illustrated in the accompanying drawings, in Which Fig. 1 is a view partly in section and partly in elevation, clearly showing the assembled relation of the various parts in operative position with respect to the associated work piece or piston;

Fig. 2 is a top plan vlew;

Fig. 3 is a sectional view 011 line 33 of Fig. 1; t

Fig. i is a side elevation of the main part of the device or spindle; and v t Fig. 5 is an end view of the enlarged portion of said spindle;

Fig. 6 is an enlarged end view of the annular centering member or adapter removably carried by the spindle;

Fig. 7 is a side elevation of the fork shaped mei'nber or driver, adapted to be inserted in the enlarged end of the spindle as shown Fig. 1; and

Fig. 8 is an end view thereof.

Referring to the drawings in detail the novel device, comprises a main portion or spindle 1. provided with a tapered shank 2 curely lock these in i and an enlarged tapered head 4, said enlarged head portion being provided with a concentrically arranged noncircular chamber or recess 5'. The tapered end of this spindle is standard for insertion in a head stock of a lathe 0r grinder to be rotatably driven thereby in the usual manner.

Supported upon the enlarged tapered head 4 of the spindle is an annular member 6 said member being constructed with a tapered bore corresponding to the taper formed on the enlarged end 4 of said spindle. This annu-. lar member 6 is removably secured in position, preferably by, a pin and cam-slot arrangement, the spindle 1 being provided with a curved slot 7 and the annular member 6 with y a cooperating inwardly projecting pin 8, whereby a partial rotation ofthe member 6 on the enlarged head 4 of the spindle will separts together in operative position.

' The outer circumference of the member 6 is formed with a beveled annular flange or the or teeth 10, the purpose ofwhich will be here- I inafter more fully disclosed.

Also cooperating with the spindle 1 is a fork shaped member or driver 11 having a base 12, a shank 13 preferably angular in cross section, and oppositely disposed parallel pins or prongs 14. This shank 12 is removably inserted in the chamber or recess 5 of the enlarged head 4; of the shank and maintained in adjusted position, preferably by a spring pressed ball locking device 15, the shank being constructed with two small recesses 16 cooperating with-the ball device in a well known manner. The shank is made slightly smaller than the receiving chamber or recess 5, to provide a small amount of play or clearance, for the purpose to be hereinafter more fully eX- "plained.

In the practical use of the complete device, and as supplied to the trade, the annular member 6 and the fork shapeddriver 11 are in reality adapters to be furnished in different sizes, so that by a simple interchanging and manipulation of parts the improved assembly is made capable of operation with pistons of varioussizes.

Each adapter 6, as supplied, has the same 7 diameter of tapered bore but a different size of flange 9, corresponding to the various sizes of standard pistons. Likewise the adapters 11 all have the same size and shape shank 13 to looselyfit the rec-essor chamber 50f the spindle l, but in each individual instance the size of the base 12 and the prongs 14 will vary, also according to the sizes oft-lieva-riousstandard pistons.

The beveled flange 9 of the annular member or adapter 6, may be plain butis preferably provided with the teeth as shown, so that as the piston is adjus tedinplace andpartially rotated to engage tlieprongsofthe driverll,

- any chipsor.burrsdeft onthe inner skirted beveled edge of the piston, will be removed and the piston will beftruly: andfirmly seated inplace. I

' Before the piston is placed into position on this device, the inner skirted edge is preferablybeveled in a manner asshownin another applicationabout to befiled by the present applicant,

As hereinbefore mentioned, the size of the shank 13 of the driver- 11 isslightly less than the recess 5, sothatl there will be a, small amount of'play therebetweenQ This is desirable and necessary, so that in case tliereis a slight difference in size and shape between the inwardly projectinglpiston pin receiving bosses, the driver 11will be permitted to accommodate itself to these differenceswithout straining the piston in an obvious manner.

It willbe noted also, that the shank 13 isprovided with two recesses 16.21 nd the head twat only one ball locking devicee lalso that the driver 11 may beinoved outwardly s and inwardly to accommodate the variable location of the piston pin bosses In actual use, only seven assorted sizes of adapters arereqniredto covera. range of sizes in. diameterof pistons from-2V to Each specific diameter does not neces- 5 sitate an adapterfor thatparticular size, it being one of the objects of lShlS lHVBIItIOIl to provide the smallest number of adapters to.

cover the range and yetallowthe cutting .tool in case of a lathe, and the grinding wheel in case of a grinder to pass over the piston and beyond w thout coming in con- 7 tact with the surfaces 10 thereby destroying this accm'atesurface for, in grinding (which is the final finishing operation) t is most desirable to have the grind ng wheel pass com-.

pletely over and beyond each end of. the piston sothat the entire surface of the grinding wheel may come. in contact with the piston.

WVhatI claim is c 7 1. The combination with a metal working machine, of a driving member provided with an enlarged ,chambered head, a removable annular member carried by said head and provided witharadially serrated beveled circumferential outer portion constructed and arranged to internally engage a hollowwork pieceto center the same thereon, "a fork: shaped member removably secured. in the, chamber in said head,the forked end ofsaid latter member adapted to internally engage said'work piece for rotating the same upon the rotation of the driving member.

2; The combination with a metal working machingof adriving spindle provided with an enlarged tapered head, a noncircular recess formed in said enlarged head, an annula-r member provided with a tapered bore and an outer circumferential beveled portion adapted to be removably secured on said tapered head, said beveled portionconstruct ed and arranged to internally engage the skirted end, of a piston. to center. the same thereon, a fork shaped member provided with a shank'removably secured, in the recess in said head, the forked end of said last mentioned member. constructed and'arranged to internally engage said piston for rotating the same upon the rotation of the spindle.

3. The combination with a metal working machine, of a driving spindle provided with an enlargedtapered head, a noncircular recessformed in saidenlarged head, an annular member provided with a tapered bore and an outercircumferential radially grooved beveled portion adapted to be removably secured on said tapered head, said beveled portion constructed and arranged to internally engage the skirted end of a piston to center the same thereon, a fork shaped memberprorecess in said head, the forked end of said last mentioned member constructed and arrangedto internally engage said piston for rotating the sameupon the rotation of the spindle.

4, Thecombination with a metal working machine'for grinding pistons including a head stock and an axially aligned centering member, of a driving member provided with a chamberedhead mounted in the head stock, a, removable annular member formed with an outer circumferential beveled portion carried'by said chambered head, said beveled portionconstructed and arranged to internally engage the skirt end of'a piston to center the same thereon, cooperating with the aforementioned axially aligned centering member, and fa fork shaped member removably secured in. the chamber in said head, the forked end of said forked member constructed and arranged to internally engage, said piston for rotating the same upon the ro-. tation of the driving, member.

5. The combination with a metal working ing machine for grinding, pistons, including a head. stock and a .centerng tail stock, of a driving spindle, provided with an enlarged recess in said head, the forked end of said forked member constructed and arranged to 10 engage the inwardly projecting piston pin bosses of said piston for rotating the same upon the rotation of the spindle.

In testimony whereof I aflix my signature.

LOUIS A. DALL. 

